noun, Pathology. 1. a hereditary disease characterized by an inability of the blood to clot because of a deficiency of a coagulation factor. noun 1. a relatively mild type of haemophilia, caused by lack of a protein (Christmas factor) implicated in the process of blood clotting Christmas disease Christ·mas disease (krĭs’məs) n. See hemophilia B.

noun, Biochemistry. 1. a blood constituent necessary for clotting, the absence of which is characterized by a hemophilialike condition. Christmas factor n. See factor IX.

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